Finding the Fourth Proportional to 85,665.40, 128,424.18 and 41,231.02

Step by Step Solution

1. Step 1: Write the proportion equation
   85,665.40 : 128,424.18 = 41,231.02 : x
2. Step 2: Convert to fraction form
   85,665.40/128,424.18 = 41,231.02/x
3. Step 3: Cross multiply
   85,665.40x = 128,424.18 × 41,231.02
4. Step 4: Simplify right side
   85,665.40x = 5,295,059,934.06
5. Step 5: Solve for x
   x = 5,295,059,934.06/85,665.40
6. Step 6: Final answer
   x = 61,810.95